Power hammer



.1a-n.. 2, 1923. I 1,440,679

0. M. HATCHER ET AL, Pow H M ER. FILE Y ,1921.

lride a. power hammer with a motor tf Fatented dan. 2,

osoiiniaimon Hanoi-inn. .anto .marins eisernen CAMPBELL, or mannaro, Miri- Nnsoiii. i

HAMMER.

Application filed May 7', 1921. Serial'No. 467,778.

To all 'whom t mt/I/ concern Be it` known that we, HATCHER and .Ti-mins Ci-inriinm CAMPBELL, citizens ot the United States, residing' in the city ot Mankato, couiity of Blue Earth and State ot lvlinnesota, have invented new and use'tiil Improvements in Power Hammers, civ

chosen to call a inotor-in-head power ham-l mer, the saine including: `a novel arrangeniontV ot' an elec-tric motor in connection with hammer mechanism propelled by said motor.

More specifically, it is our object to' proing the crank-plate shaft, the motor sha-v containing said `crank-plate sha''t without Contact therewith and beingl i'eleasably engageable with said crank-plate shaft tlirough the medium ot shock redui'fiiigr clutch members.

A turther object is to secure duiabilf;y and coinpactness otstructure by supplying, in tlielhead ot a power hammer, a driving` motor, said motor being; 'cushioned inst vibration. shocks and jars from the main hammer body `and arranged with the axis `ot its shaft in relation coincident with the 'l axis ot' the crank-plate shaft ot' the hammerf i sion o vibration, shocks or jars from the mechanism.

YV ith the foregouro `and other objects in View, which will appear inthe following description. the invention resides in the and arrangement ol member 27 is made of suoli materialand ot' "such thickness as to best protect the driving;

novel combination parts and inthe details oiconstruction here iiiatter described and claimed 1n the drawings, Figs. 1 and 2. are side and rear elevations, reslliectl'vely, oi a power hammer embodying our present invention, :ind Fig. l is an enlarged, detail, sectional View taken on the line 3-3oij F' 2, the motor, aside trom the hollow driving shaft therein, being; shown diagraiiiiiiai iffally.

Referring to `the drawings, we have used the reference numeral l() to indicate the body of our hammer. Atlixed die 11 is located on the body 10 beneath a. companion die 12 on a vertically reciprocatiiigg rain 13 connected through suitable arms 111 with a crank-plate 15 iiXed on the forward end ot a crank-plate shat't 16. rlhis shaft is revoluble in spaced forward and rear bearings 17 @sofia hliii'ron and 18 on the body 10. A' seat'19, formed on said body between 'the bearings 17 and 18, is designed tocarry i'reely amotor support 20, said support beingfitted with for ward and reary bearings 21 and 22, whichA bearings rest in `axial alignment with each other 'and also-iii the lsame .relation with respect to the bearings 17 and 18 on the body 10, A. motor 23, suitably `secured as by means of bolts (not shown) to said support 20, isequipped with a hollow driving,v shartt 24k, upon which the revoluble motor element isV mounted. This shaft'receiyes kthe shaft 16, sufficient clearance being turnishedbetween thetwo shafts so that they are at all. 1 times tree` tro-m contact, onel with the other.

Thetorward extremity ot said shaftk 24C is mounted in 'the 'bearing Q1,k the other end the-reet' being` mounted in the bearing 2Q and projecting' rearwardlytheretrom, as shown.

To this rearwardly projecting'end oi said shaft 24:', we secure, by means 'oit a key 25 vor otherwise, driving .clutch member S56, said 'clutch ineinberbeinpjdesignedto cgi-operate with a slidable clutch member 2T feathered upon the shaft 16 and vactuated through suitble means, as by theyoled crank lever 28, link 29 and yielding` tr'eadl'e 30,` shown `in Fig.: 1. 1We do not wish to limit ourselves toanyparticular torni 'oi clutch, but desire it to beunderstood that that type oit clutch adapted to arrest or lreduce thetransmisbody 10 `to the motor shaft 2st is preli'errml in our "i'ireseiit structure. The Vtorni oit member Q6 againstshocks and Vibration, without sacriliciiif; the trictionally engaging' properties ot said band 31.

Owing: to the disti-Lnce between the bearings 17 and 18 and to avoid Vibration oi the crank shaft 16, we apply a ring or collar 36 to said shaft 16, 'as shown in Fig. This ring;` is ot suitable resilient material, the same heini;` suitably fixed against endwise movement and, if desired, secured upon 'the shaftl 1.6 or tothe shatt 9A. An oiler 37, carried by the shaft 24:, is designed to lubricatc the bearing surface of said ring.-

rlhe seat 19,` as aforesaid, freely carries the motor support 20. A resilient rest 32- of rubber or other suitable material is inter- 4motor including a hollow driving posed between. the support 20 and seat 1S). Said rest, supplying the only contact between the support 2O and body l0, cushions the motor Q13 against vibration shocks and jars from said body. mea-iis for anchoring the support 2O against the seat i9, said means comprising bolts passing through said seat and the base of said support 20 and including'compression springs 3a' interposed between the togy of saidbas'e and nuts 35 onsaid bolts.

Changesk in the specific forin'of our invention., as herein disclosed, may be' made within the scope of what is claimed without departing from lthe spirit ofour invention.

lila-ving described our invention, what we claim as new and desire to secure by Letters Patent is:

l. A. power haiiim'er, including a body, spaced bearings in said body, a crank-plate shaft revoluble in saidbearings, a support, a resilient rest on said body 'for said support, clamping means for yieldingly securing said support upon saidk rest, bearings in the support in -axial alignment with said bearings in said body, a motorV mounted upon the support, said motor including a hollow driving shaft revoluble-in the` bearings in said support and encircling` said cranlrplate shaft without contacttherewith and cofoperating clutch members on said shafts. i

power hammer includinga body, spaced bearings in said body, a crank-plate vshaft revoluble in said bearings, a support having` a cushioned rest on lt-he body, bearings in said support in axial alignment with the bearings in said body, a motor y mounted upon said support, said motor including a; hollow driving shaft revolubleY in the bearings in said support and encircling said cranlrplate shaft without contact therewith and co-operating clutch members on said shafts.

3. A' power hammer including a body, a

crank-plate shaft ournalled therein, a supi port having a cushioned rest on the body, a motor mounted on said support, said shaft l/Ve supply yielding Lai-devo journaled iii-.the support and encircling said crank-plate shaft without contact therewith, and co-operating clutch members on said shafts adapted to compensate for variations inthe axial relation thereof occasioned by shocks and vibration.

1l. .Ai power device of the class described, including a motor, having a hollow driving sha-ft, adriven shaft passing through said driving shaft without contact therewith and co-operating clutch members `for frictionally coupling said shafts,v said membersfbeing adapted to compensate for axial variations between the shafts occasioned by shocks and vibration.

5. In a power hammer, a driven shaft, a motor cushioned against shocks and jars, the revolubleelement of said motor and the driven'shaft being arran'gedin axial alignment, a clutch member on the` driven shaft and a companion clutch memberY on'v said revoluble motorv element, said clutch'members compensating for axial variationsin said. shafts due' to shocks and jars set up in the hammer.

6. A. power device including a motor having a hollow driving shaft, a driven shaft, passingv freely throughy said hollow shaft, bearings forlsaid shafts near the ends thereof, a resilient ring. interposed between the adjacent periphe-ries'of said shafts in substantially medial relation with respect` to thebearingsof said driven shaft,and cooperating clutch members for frictionally coupling said shafts.

7. A. power hammer including a body, spaced bearings inY thefbody, a crank-plate shaft revo-lubl'e in= said bearings, a support having a cushioned rest on the bodybetwe'en said bearings, a motor mounted on said support, said motor having a sleeve-like driving shaft freely receivingsaid crank-plate shaft and co-operating clutch members, between the motor. and one of said bearings, for frictionallfy coupling said shafts.

ln testimony whereof, we have signed our names to this specification.

OSCAR- MILTON HATCHER, JAMES CHAPMAN CAMBELL. 

